Pulsating screen.



UNITED STATES PATENT GFFICE.

EDGAR B. SYMONS, F MILWAUKEE, WISCONSIN.

' PULsA'rING SCREEN.

l T0 all whom it may concern Be it known that I, EDGAR B. SYMoNs, acitizen of the United States, residing at Milwaukee, in the county ofMilwaukee and State of lWisconsin, have invented a certain new anduseful Improvement in Pulsating Screens, of which the following is aspecilication.

My invention relates to improvements in pulsating screens and, whilepulsating screens themselves have long been known, it has many markedfeatures of superiority to the general run of such devices. Among thesefeatures of superiority one is that in the ordinary shaker or pulsatingscreen the movement in either direction is equally rapid. Theconsequence is that the stone is tossed in the air and, before it hastime to settle, the screen comes up and again strikes it throwing itfarther up so that the movement of the material in the screen is-verygreat and the opportunity for settling and separating is very small as,instead of occurring during the period while the stone is at rest itonly occurs at that instant when the stone is being violently struck bythe screen and the stone thus has no time to settle on the screen andfall through the perferations before the next upward toss. In any deviceI provide means whereby the upward toss is relatively rapid and violentwhile the down ward retraction or downward movement is comparativelyslow, thus giving ample time for this settling and sifting of thematerial which is so necessary. j

AAnother advantage of my device is that by means of the spring supportsthere are none of the` ordinary hanger bearings to knock and rattle andget stiff and wear out. Also the pressure on the drive bearings isalways'in one direction. There is no reciproeating movement inside ofthe bearing such as might and so frequently docs ruin them.

My invention is illustrated diagrammatically in one form in theaccompanying drawings, wherein- Figure l is a plan view with partsbroken away; Fig. 2 is a section along the line 2-2 of Fig. l with partsbrokenaway; Fig. 3 is a section along the line 3-3 of Fig. 1.

Specification of Letters Patent.

Like parts are indicated by like letters throughout the several figures.

A is a supporting frame or base open at top and bottom.

A1 is a hopper mounted thereon.

'A2 is a feed chute discharging into the hopper.

A3 is a feed-supply discharging from the hopper. B is a pulsating frameopen at top and bottom, partially closed 'at the bottom by the screenVB1.

B2 is a scoop or chute pivotally mounted on and extending across one endof 'the pulsating frame Band discharging downwardly Patented June 1,1915. Application led February 7, 1918*. Serial No. 746,695.

toward the screen B1 adapted to receive the discharge from the supplyA3.

B3 is a screw-threaded member provided with adjusting nuts B1 inengagement with the lugs B5 on the frame B and chute B2 wherelby theangle of inclination of the chute may be controlled or adjusted.

` C C are hangers rigidly attached to the frame or base A.

C1 C1 are hangers rigidly attached to the pulsating frame B.

C2 C2 are supporting and throwing springs Vrigidly attached'to thehangers C Cv and. 4C1 C1'.

D is a housing mounted on the bearing frame Dl.

The .bearing frames D1 and D2 are each- 4supported on the frame or baseA.

D3 is a rock shaft rotatably mounted in the bearings D4 D5 on thebea-ring frames D2 D1 respectively.

D6 D are rocker arms keyed to the shaft v D3 adjacent each side of theframe B.

D7 D7 are brackets or hangers rigidly attached to the side of the frameB and in pivotal connection .with the rocker arms D D5.

' DB D8v are lingers projecting upwardly and forwardly from the hangersD7 D.

E is a tie rod supported at either end on one of the frames D1 D?.

El El are cup washers resting upon said tie rod E and surrounding and inslidable contact withI the rods E2 E2 whihare: in slidable engagementwiththe tiefrod E and terminate in the hooks l 3 E3 in hooked engagementwith the ngers D8.'

E? E are ciip washers mounted on the free ends of the rods E? E2 held inadJustable position thereon by means of the nuts E E. The springs Esurround. the rods 'or bars E2 and are in engagement at either end with.

one of the lwashers E? El adapted to-be com stricted between thesewashers when the rods E2 are drawn inwardly toward the' screen.

F is a cam or drive shaft rigidly mounted in the bearings F1 F on theframes D2 D1.

lf3 is a. driving pulleyrigidly attached to the shaft F and adapted tobe driven by' any suitable source of power not shown. F4 is a four-pointcam rigidly attachedto the shaft F.

- F5 -is a rocker arm rigidly attached to the rock shaft D? haring: thecontact' block F6 in engagement with the cam F1.

is a filling opening whereby the housings; "D may be filled with grease.

F8 is a discharge opening whereby it may be emptied er drained.

Referring to the cam F* it will be noted that the angle a issubstantially one-half of the angle o and that the cam rotates in thedirection indicated by the arrow. It: will be further noted thatwhen'the device is in4 the normal, upright or raised 1position asindicated invlig. 2 the springf C2 is" substantially parallel with thecrank D",

lt will be evident that, while l have shown in my drawings an operativedevice, still many changes might be made in size, shape and arrangementof parts without departing 'materially from the spirit of my invention rand I wish therefore that my drawings be regarded as in a sensediagrammatic.

The use and operation of my invention are as followszwWith the parts inthe assembledposition as indicated in the drawings the housing or casing1s rst substantially filled with heavy ell or grease. The machine-is'lthen started the cam rotating in the direclt will benoted thatwith' tion of the arrow.,

the parts in the Aposition shown in Figc?) as y the Cem mates ai@blocker pillow r Win y j move' rapidly inward toward the center of thecam shaft until the point has been reached. lt will then 'graduallybefo'rced out until it reaches the 'point y. 'lt will then rapidlyreturn to the inside position until 'the point e isreached. .Thisprocess will continue as long as the cam is rotated; lt

'^ will be noted that `the angular distaneetraversed between thepoin'tsy/ and .e g is substantially twice great as the angular distancetraversed hetweenrthe points /lr andI 1,1 e so that the upward movementcaused by j the spring will be twine as rapid as theV`` the spring earn.The rorffoyenient' agi fessee; by te.. rotation oi. t

tation of the cam will, of course, rock the roel; shaft and cause therocker armste ro- 66 tatedepressing the .screen but also pressing itbackward so that the screen` when acted upon by the 'spring will be shotforward and vupward andthe material on the screen will also be shotforward and upward. This will '10 result in projecting the materialwhich is supportedon the surface of the Screen for- -ward and upward andgradually carrying it over to the open yend. The long time during whichthe screen is being forced down 76 ,gives ample time for the material tosettle 'on thev screen and be sifted through it in-- stead of beingbatted up by the Screen while still in the air and before being sifted,vand as the screen pulsates the material will be 80V spring-S and as thiswork is done lslowly and evenly the load upon the bearings .and upon themachinery is very slight, the 1 yiolentjerking being done by the springswhich are y not likely 'to be harmed by it instead of being done bybearings which would bever 96 materially harmed.

I claim: l. A'soreen comprising a perforated fabric, a frame to supportthe same', means lfor feeding` the material to be screened onto one endof such fabric, means for 'confining the fabric during operationV toplanes lparallel one to the other and means for movmg it bodily swiftlyupwardly and longitudinally 'away from the feed and slowly in .thereverse 106 direction.

. 2. A screencomprising a perforatedfabric, a frame to snpporL thesame,` means for feeding the material to be screened 'onto one end ofsuch fabric, and means for moving it bodily swiftly upwardly andllongitildirxally away from the feed and slowly in ther'eversedirection, such motion equal atboth ends.-

3. AA screen lcomprising" .a V1'deri'fo'rated fab-A plane, a frame tosupportl the same, means j for feeding the material to be screened ontooneend of such fabric' and elastic support-4 ing'devices, one atveachend of the fabric frame and' both adapted to giveayertical 120 andhorizontal motion to the end of the -frame.with which it is associated.l

e. :A screen comprising a perforated fabric5 e frame .to support thesame, means for` feeding;r the material 'to be screened onto one 126 endof such fabric, a spring support for each The' weight of the screen 86vric located. in', a substantially horizontal 116 fili end of the framewith which it is assoelzmed end of the abo frame adapted, to bothvel-meal and horizontal motion i and means for moving the frame clown--Wardly and rearwardly in the direction toward the feed and to releaseit so that said springs may move it swiftly vupwardly and 'orvgfmfdlyvaway from the feed.

Winesses F. Vf. FABmm, Josemi.

